1 //===-- llvm/Target/ARMTargetObjectFile.cpp - ARM Object Info Impl --------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "ARMTargetObjectFile.h"
11 #include "ARMTargetMachine.h"
12 #include "llvm/ADT/StringExtras.h"
13 #include "llvm/IR/Mangler.h"
14 #include "llvm/MC/MCAsmInfo.h"
15 #include "llvm/MC/MCContext.h"
16 #include "llvm/MC/MCExpr.h"
17 #include "llvm/MC/MCSectionELF.h"
18 #include "llvm/Support/Dwarf.h"
19 #include "llvm/Support/ELF.h"
20 #include "llvm/Target/TargetLowering.h"
21 using namespace llvm;
22 using namespace dwarf;
23 
24 //===----------------------------------------------------------------------===//
25 //                               ELF Target
26 //===----------------------------------------------------------------------===//
27 
28 void ARMElfTargetObjectFile::Initialize(MCContext &Ctx,
29                                         const TargetMachine &TM) {
30   bool isAAPCS_ABI = static_cast<const ARMTargetMachine &>(TM).TargetABI ==
31                      ARMTargetMachine::ARMABI::ARM_ABI_AAPCS;
32   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
33   InitializeELF(isAAPCS_ABI);
34 
35   if (isAAPCS_ABI) {
36     LSDASection = nullptr;
37   }
38 
39   AttributesSection =
40       getContext().getELFSection(".ARM.attributes", ELF::SHT_ARM_ATTRIBUTES, 0);
41 }
42 
43 const MCExpr *ARMElfTargetObjectFile::getTTypeGlobalReference(
44     const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM,
45     MachineModuleInfo *MMI, MCStreamer &Streamer) const {
46   if (TM.getMCAsmInfo()->getExceptionHandlingType() != ExceptionHandling::ARM)
47     return TargetLoweringObjectFileELF::getTTypeGlobalReference(
48         GV, Encoding, TM, MMI, Streamer);
49 
50   assert(Encoding == DW_EH_PE_absptr && "Can handle absptr encoding only");
51 
52   return MCSymbolRefExpr::create(TM.getSymbol(GV, getMangler()),
53                                  MCSymbolRefExpr::VK_ARM_TARGET2, getContext());
54 }
55 
56 const MCExpr *ARMElfTargetObjectFile::
57 getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
58   return MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_ARM_TLSLDO,
59                                  getContext());
60 }
61